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Major defects may see the vehicle being less safe and have an impact on the environment, putting other road users at risk.

Dangerous defects have an immediate risk to road safety and have an impact on the environment.

The new rules will start from May 20 but an RAC spokesman said they fear the changes could end up confusing motorists.

He said: "Rather than MOT failures simply being black and white, the new system creates the potential for confusion as testers will have to make a judgement as to whether faults are Dangerous, Major or Minor.